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Tesla 2170 Battery Cell

Picture of the official Tesla 2170 battery cell taken at the Gigafactory grand opening by Jude Berger.
Dimensions are 21mm x 70mm. These will be used in the Model 3 initially and then in the Model S and X

The energy density is NOT 31% greater. The volume is 31% greater. The energy is 31% greater. The energy density is roughly the same as the traditional 18650 cells used in the Model S and X when using the same chemistry. With new chemistries the energy density will increase in small increments, but the size does not change the energy density. A big box full of 18650 cells would have the same energy and energy density as the same box filled with the 21 x70 cells.